I still wonder why a conductor on the train could NOT see an ICd subscription on your card, instead of loading it on another (other than that useless) sepsrate/extra ov-chipcard

Basically the same as traveling 1st class with a 2nd class (Flex) subscription. They will look into the system and if there is no direct/visible match, make a notice so the system can work that out afterwards.

I still wonder why a conductor on the train could NOT see an ICd subscription on your card, instead of loading it on another (other than that useless) sepsrate/extra ov-chipcard

Basically the same as traveling 1st class with a 2nd class (Flex) subscription. They will look into the system and if there is no direct/visible match, make a notice so the system can work that out What do you suggest i do if i want to get a monthly subscription for the intercity direct if i can’t put it on my card?

Can i put it on another card and have the controlers scan both cards one for the flex dal vrij and one for the toeslag ?

I take the intercity direct about 8 to 10 times a week so checking it in every time would be really expensive

Yes, do this, I do exactly the same thing. Order a new card, and put the IC direct monthly supplement on this, You just give the conductor your 2 cards, should work without a problem.